中学学科网 小学学科网 数字校园平台 组卷网 小学组卷网 教评网 学易书城
e卷通介绍 使用手册 收藏本站 有奖挑错建议
题型:解答题 难度系数:0.65 引用次数:249 更新时间:2019/06/15 10:41:48 题号:8221728
如图,在直角梯形eqId5ce7a06ae7a34393b92b5277978ac014中,eqId0d9961f0e84b4330a8b12a6efe4f3804,eqIdf635185beec44b6b86934e806f088b02, eqId18e3ae3e255349039d6726b8293c6cabeqIdded28dbc6ca54681ab966fe6545c6cdceqIdd9251115c9a9452088ecefa7fbb94bf8,点eqId93cbffaa5ae045d6ac45d1e979991c3aeqId34c6b6e427744abfb88dc90b8c7c2111上,且eqIdbae2ef596ca941b89c53f1059c2148aa,将eqId1ba8a6a849e04b31abd4a64a759061b5沿eqId7fd836b3d4ac4d398fb8e461e090364c折起,使得平面eqId0ab1105ccd73407e94304ecdd3826a0a平面eqId41b0fa6b45c44cf0aeaa1b53230916f1(如图),eqId92869ac114124367b45f631d030ed6bdeqId7fd836b3d4ac4d398fb8e461e090364c中点.
(Ⅰ)求证:eqId64d1930b6d2543918fe8f4cf888830c8平面eqId41b0fa6b45c44cf0aeaa1b53230916f1
(Ⅱ)求四棱锥eqIdade73050d9d84a649183fd4abf1227a9的体积;
(Ⅲ)在线段eqId1b51efe7c2fa42748ac5a6be262e2fa4上是否存在点eqIdd7be5abad1e34f6db17a56660de8d54f,使得eqId79bd4080945b4cba8e8cde7b608c5ac1平面eqId28f374605af2463f991d1dd23797fec1?若存在,求eqIdc02b3bc95ab346b89a60b73365aac0d3的值;若不存在,请说明理由.figure
类题推荐
【推荐1】如图,在直角梯形eqId5ce7a06ae7a34393b92b5277978ac014中,eqId0d9961f0e84b4330a8b12a6efe4f3804eqIdf635185beec44b6b86934e806f088b02eqId18e3ae3e255349039d6726b8293c6cabeqIdded28dbc6ca54681ab966fe6545c6cdceqIdd5735132a5b2464281c8dccfa8a0c08b,点eqId93cbffaa5ae045d6ac45d1e979991c3aeqId34c6b6e427744abfb88dc90b8c7c2111上,且eqIdbae2ef596ca941b89c53f1059c2148aa,将eqId1ba8a6a849e04b31abd4a64a759061b5沿eqId7fd836b3d4ac4d398fb8e461e090364c折起,使得平面eqId152c68569180470696ea37ab76b3d7bd平面eqId32b0a8afc9814c2f8a154deafdcf7192(如图).eqId92869ac114124367b45f631d030ed6bdeqId7fd836b3d4ac4d398fb8e461e090364c中点.
figure
(1)求证:eqId8f10b97a402f40639571beefda64ad40平面eqId32b0a8afc9814c2f8a154deafdcf7192
(2)求四棱锥eqIdbd0442c33c474714bf3611ad246c8ed2的体积;
(3)在线段eqId1b51efe7c2fa42748ac5a6be262e2fa4上是否存在点eqIdd7be5abad1e34f6db17a56660de8d54f,使得eqId8628e578a6454d31ac5b8d2bfbea7202平面eqId28f374605af2463f991d1dd23797fec1?若存在,求eqIdc02b3bc95ab346b89a60b73365aac0d3的值;若不存在,请说明理由.
难度系数:0.85使用:300次题型:解答题更新:2019/7/8
【推荐2】如图所示,在四棱锥eqIdac097205e9cb41279269aadcac3fb6f1中,四边形eqId5ce7a06ae7a34393b92b5277978ac014为矩形,eqId42ca8293f64c4876be63105ac1346c83为等腰三角形,eqId6936fa87b64144a78810892e7ef59ed9,平面eqId3084aa1e379e4f168e9c2332df2ca9df平面eqId5ce7a06ae7a34393b92b5277978ac014,且eqIdd9ddcab1c81d418284d93ad065e4775a分别为eqId10c6b5c666c647a5880233e45dda8fbb的中点.
figure
(1)证明:eqIda5e4dd5d4b81428cbff4de50c7bf234c平面eqId02dc5b9712104a18adc92a366a8c2455
(2)证明:平面eqId9c81b9a221564d2b8ec2404607fec64c平面eqId02dc5b9712104a18adc92a366a8c2455
(3)求三棱锥eqId9d1b47039059485d9183dc3ad1f5e959的体积.
难度系数:0.4使用:263次题型:解答题更新:2019/7/13
【推荐3】如图,在直三棱柱eqId2cf3aba311bf4a0ca1b06fb7551ddcaf中,eqId532e65ee0ed041878ca0c61b0c554e60eqId1fec314040fa47cdb7ab2439055ba613.
figure
(1)求证:eqIde2a08563fb0140d3b16360de6f7d6c7a平面eqId076f835a1f2c428898c79204bd1d52fd
(2)若点eqId06e60c1a2261437ba646a9bc18a212b1在线段eqId1dcb20a9ce8d4076af5dd64f7066c6d6上,且eqId2c51f5050ef9490b92503c9d8a238b34,求三棱锥eqId89f3214617264b69b5f3b88ab8582108的体积.
难度系数:0.94使用:118次题型:解答题更新:2019/7/15
试题点评
评论:
发布